Pre-1920 EXIF date weirdness

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matti
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Joined: Sat Dec 31, 2016 12:13 pm

Pre-1920 EXIF date weirdness

Post by matti » Mon Aug 20, 2018 9:10 pm

I have adjusted EXIF dates in old scanned .jpg photos via the GC browser (I also save Caption, Keywords, GPS and rating to the files). I rename the files as YYYY-MMDD-hhmm-ss.jpg (OS X 10.11.6, GC 10.6.2).

Why do pre-1920 EXIF dates behave like this:

I set the EXIF date as 1920-0601-1000-00 but the file is renamed as 1920-0601-1000-22.jpg.

As a workaround I shift the EXIF timestamp TWICE with -22 seconds (-44 seconds just once does not do it), THEN the file can be renamed correctly as 1920-0601-1000-00.jpg.

Why does this happen??

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Re: Pre-1920 EXIF date weirdness

Post by forum_adm » Mon Aug 20, 2018 10:01 pm

Please forward a sample file for testing to support@lemkesoft.de

matti
Posts: 21
Joined: Sat Dec 31, 2016 12:13 pm

Re: Pre-1920 EXIF date weirdness

Post by matti » Sat Jun 29, 2019 8:14 pm

"1921 east european time zone was in effect 1.5.1921. It was +20 min 10,9 sec the previous time."

https://fi.wikipedia.org/wiki/Suomen_aika

That date is indeed the breaking point for this effect.

So maybe because I get +11 seconds (or +22 seconds for file rename??) for times before 1921-0501 relates to this? But that somehow misses those +20 minutes.
1921.jpg
1921.jpg (39.46 KiB) Viewed 219 times

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